Schaum's Outline of Trigonometry by Robert E. Moyer

Author:Robert E. Moyer
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2018-04-15T04:00:00+00:00

6.10 Find all positive values of θ less than 360° for which cos θ = 0.9063.

There are two solutions, θ = 25° in the first quadrant and θ = 360° − 25° = 335° in the fourth quadrant.

6.11 Find all positive values of θ less than 360°, given sin θ = 0.6428.

The two positive angles less than 360° for which sin θ = 0.6428 are θ = 40° and θ = 180° − 40° = 140°. But if θ is to include all values less than 360°, θ must include all values less than 4 · 360° = 1440°. Hence, for θ we take the two angles above and all coterminal angles less than 1440°; that is,

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